Electrical Adjustments - Sony HCD-GZR7D Service Manual

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DVD SECTION
When the optical pick-up assy is replaced, perform the "Execute
IOP Measurement".
Execute IOP Measurement (See page 35)
[TEST DISC LIST]
Be sure to use the DVD disc that matches the signal standards of
your region.
• CD
YEDS-18
PATD-012 (Part No.: 4-225-203-01)
• DVD SL (Single Layer)
NTSC : HLX-503
HLX-504
PAL : HLX-506
• DVD DL (Dual Layer)
NTSC : HLX-501
HLX-505
PAL : HLX-507
[RFMON Level Check]
Connection:
DMB18 board
CN105 pin
CN105 pin
Procedure:
TE
1. Connect an oscilloscope to CN105 pin 6 (RFMON) and
L 13942296513
CN105 pin 3 (GND) on the DMB18 board.
2. Turn the power on.
3. Set the test disc (refer to the TEST DISC LIST) on the tray
and press [Y] button to playback.
4. Confi rm that oscilloscope waveform is clear and check
RFMON signal level is correct or not.
Note: A clear RFMON signal waveform means that the shape
"◊" can be clearly distinguished at the center of the
waveform.
RFMON signal waveform
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ELECTRICAL ADJUSTMENTS

(Part No.: 3-702-101-01)
(Part No.: J-6090-069-A)
(Part No.: J-6090-088-A)
(Part No.: J-6090-077-A)
(Part No.: J-6090-071-A)
(Part No.: J-6090-089-A)
(Part No.: J-6090-078-A)
oscilloscope
(RFMON) +
(GND) –
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
level: 0.58 ± 1.23 Vp-p (DVD)
0.57 ± 1.1 Vp-p (CD)
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SECTION 6
2 9
8
Checking Location: DMB18 board (Side A)
DMB18 BOARD (SIDE A)
IC201
TUNER SECTION
FM Tune Level Check
signal
generator
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3 6 7 1 3 1 5
Procedure:
1. Turn on the set.
2. Input the following signal from signal generator to FM
antenna input directly.
Carrier frequency: A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation : 75 kHz
Modulation : 1 kHz
ANT input : 35 dBμ (EMF)
Note: Use 75 ohm coaxial cable to connect signal generator and
the set.
You cannot use video cable for checking.
Use signal generator whose output impedance is 75 ohm.
3. Set to FM tuner function and tune A, B and C signals.
4. Confi rm "TUNED" is lit on the display for A, B and C
signals.
When the selected station signal is received in good condition,
"TUNED" is displayed.
co
.
HCD-GZR7D/GZR8D/GZR9D
9 4 2 8
IC102
IC101
CN401
CN110
CN105
CN105 pin CN105 pin
(GND)
(RFMON)
set
0 5 8 2 9 9 4 2 8
m
9 9
9 9
39